I love my iMac, mostly because I'm a bit of a Luddite and therefore need the user-friendly aspects of the machine. Having said that, though, I indulged in an Acer sub-notebook to take when travelling, mostly for the size of the thing, as it weighs 800gm.

The sub-notebooks are available with a Linux OS (with plenty of applications installed) which I chose over Windows; as a travelling companion a sub-notebook is a handy thing to have but it won't take the place of a proper home computer.